Spatiotemporal quantification of AlO around a burning micro-sized Al droplet using laser absorption imaging

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-09-24 DOI:10.1016/j.combustflame.2025.114472

Weitian Wang , Zhiyong Wu , Xing Chao , Marcus Aldén , Zhongshan Li

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引用次数: 0

Abstract

By combining the quantitative advantage of laser absorption spectroscopy and the superior spatiotemporal resolution of high-speed microscopic imaging, we report, for the first time, the transient aluminum monoxide (AlO) concentration distribution around a burning micro-sized aluminum droplet in water-vapor-rich ambient. Arrangement of two lasers at resonant and non-resonant wavelengths, respectively, eliminates the non-resonant extinction interference from condensed-phase products. The AlO concentrations are found to increase as the combustion proceeds and reach a plateau approximately 10 ms after ignition. The AlO concentration increases from a negligible level near the droplet surface to a peak within the condensed layer, decreases, and spreads beyond it. The maximum molar concentration observed over time reaches approximately 2%. The proposed method enables high spatiotemporally resolved inspection of AlO species, offering a powerful diagnostic tool for further insights into the mechanism of Al combustion process.

Novelty and significance statement High spatiotemporally resolved AlO distribution around a burning micro-sized aluminum droplet is obtained quantitatively for the first time using high-speed laser absorption imaging. Two lasers at resonant and non-resonant wavelengths, respectively, eliminate the non-resonant extinction interference from condensed-phase products. The proposed experimental system can readily provide instantaneous AlO concentration data for mechanism and modeling studies of Al combustion.

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利用激光吸收成像技术对燃烧微尺寸Al液滴周围的AlO进行时空量化

结合激光吸收光谱的定量优势和高速显微成像优越的时空分辨率，首次报道了富水蒸气环境中燃烧微尺寸铝液滴周围的瞬态氧化铝浓度分布。在共振和非共振波长分别布置两个激光器，消除了来自凝聚相产物的非共振消光干扰。发现随着燃烧的进行，AlO浓度增加，并在点燃后约10 ms达到平台。AlO浓度从液滴表面附近的一个可忽略的水平上升到凝聚层内的一个峰值，然后下降并扩散到凝聚层之外。随着时间的推移，观察到的最大摩尔浓度约为2%。该方法实现了高时空分辨率的AlO物种检测，为进一步了解Al燃烧过程的机制提供了强大的诊断工具。利用高速激光吸收成像技术，首次定量地获得了燃烧微尺寸铝液滴周围高时空分辨的AlO分布。谐振和非谐振波长的两种激光器分别消除了来自凝聚相产物的非谐振消光干扰。该实验系统可为铝燃烧机理和模拟研究提供瞬时的氧化铝浓度数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.